Cut your watermelon into 1-inch chunks, removing seeds if necessary. Pro tip: Frozen watermelon chunks work exceptionally well and eliminate the need for additional ice, resulting in a more concentrated flavor profile without dilution.
Place watermelon chunks, frozen strawberries, and banana in your blender. Position heavier ingredients closest to the blade for more efficient blending and smoother texture.
Add lime juice, mint leaves (if using), yogurt, and sweetener (if needed). The acid from the lime juice brightens the flavor significantly while also helping to preserve the vibrant color of your Watermelon Smoothie.
Pulse initially to break down larger chunks, then blend on high speed for 45-60 seconds until completely smooth. If your blender struggles, add 1-2 tablespoons of water or coconut water to help things along.
Sample your creation and adjust sweetness or thickness according to preference. Remember that watermelon's natural sugar content varies significantly depending on ripeness, so flexibility is key.
Serve immediately in chilled glasses for maximum refreshment. For an Instagram-worthy presentation, garnish with a watermelon wedge, mint leaves, or a sprinkle of chia seeds.